辺材
樹皮の下にある、外側の若い木部。水と、それに溶けた無機養分を木の中に運ぶ。
Sapwood in a young black walnut trunk cross-section (Juglans nigra)
すべての言語
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参考資料
- US Forest Products Laboratory Wood Handbook — sapwood is the active water-conducting, lighter-colored wood adjacent to bark
- USDA Forest Service technology-transfer sheet — black walnut sapwood is nearly white and contrasts with chocolate-brown heartwood
- University of Illinois Extension — eastern black walnut commonly has ten to twenty annual growth rings in its sapwood